// ===============================================================================
// Microsoft Data Access Application Block for .NET
// http://msdn.microsoft.com/library/en-us/dnbda/html/daab-rm.asp
//
// SQLHelper.cs
//
// This file contains the implementations of the SqlHelper and SqlHelperParameterCache
// classes.
//
// For more information see the Data Access Application Block Implementation Overview. 
// ===============================================================================
// Release history
// VERSION	DESCRIPTION
//   2.0	Added support for FillDataset, UpdateDataset and "Param" helper methods
//
// ===============================================================================
// Copyright (C) 2000-2001 Microsoft Corporation
// All rights reserved.
// THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY
// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT
// LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR
// FITNESS FOR A PARTICULAR PURPOSE.
// ==============================================================================

using System;
using System.Collections;
using System.Data;
using System.Data.SqlClient;
using System.Xml;

/// <summary>
/// The SqlHelper class is intended to encapsulate high performance, scalable best practices for 
/// common uses of SqlClient
/// </summary>
public sealed class SqlHelper
{
	#region private utility methods & constructors

	// Since this class provides only static methods, make the default constructor private to prevent 
	// instances from being created with "new SqlHelper()"
	private SqlHelper()
	{
	}

	/// <summary>
	/// This method is used to attach array of SqlParameters to a SqlCommand.
	/// 
	/// This method will assign a value of DbNull to any parameter with a direction of
	/// InputOutput and a value of null.  
	/// 
	/// This behavior will prevent default values from being used, but
	/// this will be the less common case than an intended pure output parameter (derived as InputOutput)
	/// where the user provided no input value.
	/// </summary>
	/// <param name="command">The command to which the parameters will be added</param>
	/// <param name="commandParameters">An array of SqlParameters to be added to command</param>
	private static void AttachParameters(SqlCommand command, SqlParameter[] commandParameters)
	{
		if (command == null) throw new ArgumentNullException("command");
		if (commandParameters != null)
		{
			foreach (SqlParameter p in commandParameters)
			{
				if (p != null)
				{
					// Check for derived output value with no value assigned
					if ((p.Direction == ParameterDirection.InputOutput ||
						p.Direction == ParameterDirection.Input) &&
						(p.Value == null))
					{
						p.Value = DBNull.Value;
					}
					command.Parameters.Add(p);
				}
			}
		}
	}

	/// <summary>
	/// This method assigns dataRow column values to an array of SqlParameters
	/// </summary>
	/// <param name="commandParameters">Array of SqlParameters to be assigned values</param>
	/// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values</param>
	private static void AssignParameterValues(SqlParameter[] commandParameters, DataRow dataRow)
	{
		if ((commandParameters == null) || (dataRow == null))
		{
			// Do nothing if we get no data
			return;
		}

		int i = 0;
		// Set the parameters values
		foreach (SqlParameter commandParameter in commandParameters)
		{
			// Check the parameter name
			if (commandParameter.ParameterName == null ||
				commandParameter.ParameterName.Length <= 1)
				throw new Exception(
					string.Format(
						"Please provide a valid parameter name on the parameter #{0}, the ParameterName property has the following value: '{1}'.",
						i, commandParameter.ParameterName));
			if (dataRow.Table.Columns.IndexOf(commandParameter.ParameterName.Substring(1)) != -1)
				commandParameter.Value = dataRow[commandParameter.ParameterName.Substring(1)];
			i++;
		}
	}

	/// <summary>
	/// This method assigns an array of values to an array of SqlParameters
	/// </summary>
	/// <param name="commandParameters">Array of SqlParameters to be assigned values</param>
	/// <param name="parameterValues">Array of objects holding the values to be assigned</param>
	private static void AssignParameterValues(SqlParameter[] commandParameters, object[] parameterValues)
	{
		if ((commandParameters == null) || (parameterValues == null))
		{
			// Do nothing if we get no data
			return;
		}

		// We must have the same number of values as we pave parameters to put them in
		if (commandParameters.Length != parameterValues.Length)
		{
			throw new ArgumentException("Parameter count does not match Parameter Value count.");
		}

		// Iterate through the SqlParameters, assigning the values from the corresponding position in the 
		// value array
		for (int i = 0, j = commandParameters.Length; i < j; i++)
		{
			// If the current array value derives from IDbDataParameter, then assign its Value property
			if (parameterValues[i] is IDbDataParameter)
			{
				IDbDataParameter paramInstance = (IDbDataParameter) parameterValues[i];
				if (paramInstance.Value == null)
				{
					commandParameters[i].Value = DBNull.Value;
				}
				else
				{
					commandParameters[i].Value = paramInstance.Value;
				}
			}
			else if (parameterValues[i] == null)
			{
				commandParameters[i].Value = DBNull.Value;
			}
			else
			{
				commandParameters[i].Value = parameterValues[i];
			}
		}
	}

	/// <summary>
	/// This method opens (if necessary) and assigns a connection, transaction, command type and parameters 
	/// to the provided command
	/// </summary>
	/// <param name="command">The SqlCommand to be prepared</param>
	/// <param name="connection">A valid SqlConnection, on which to execute this command</param>
	/// <param name="transaction">A valid SqlTransaction, or 'null'</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <param name="commandParameters">An array of SqlParameters to be associated with the command or 'null' if no parameters are required</param>
	/// <param name="mustCloseConnection"><c>true</c> if the connection was opened by the method, otherwose is false.</param>
	private static void PrepareCommand(SqlCommand command, SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, out bool mustCloseConnection)
	{
		if (command == null) throw new ArgumentNullException("command");
		if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText");

		// If the provided connection is not open, we will open it
		if (connection.State != ConnectionState.Open)
		{
			mustCloseConnection = true;
			connection.Open();
		}
		else
		{
			mustCloseConnection = false;
		}

		// Associate the connection with the command
		command.Connection = connection;

		// Set the command text (stored procedure name or SQL statement)
		command.CommandText = commandText;

		// If we were provided a transaction, assign it
		if (transaction != null)
		{
			if (transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
			command.Transaction = transaction;
		}

		// Set the command type
		command.CommandType = commandType;

		// Attach the command parameters if they are provided
		if (commandParameters != null)
		{
			AttachParameters(command, commandParameters);
		}
		return;
	}

	#endregion private utility methods & constructors

	#region ExecuteNonQuery

	/// <summary>
	/// Execute a SqlCommand (that returns no resultset and takes no parameters) against the database specified in 
	/// the connection string
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders");
	/// </remarks>
	/// <param name="connectionString">A valid connection string for a SqlConnection</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <returns>An int representing the number of rows affected by the command</returns>
	public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText)
	{
		// Pass through the call providing null for the set of SqlParameters
		return ExecuteNonQuery(connectionString, commandType, commandText, (SqlParameter[]) null);
	}

	/// <summary>
	/// Execute a SqlCommand (that returns no resultset) against the database specified in the connection string 
	/// using the provided parameters
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
	/// </remarks>
	/// <param name="connectionString">A valid connection string for a SqlConnection</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
	/// <returns>An int representing the number of rows affected by the command</returns>
	public static int ExecuteNonQuery(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
	{
		if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");

		// Create & open a SqlConnection, and dispose of it after we are done
		using (SqlConnection connection = new SqlConnection(connectionString))
		{
			connection.Open();

			// Call the overload that takes a connection in place of the connection string
			return ExecuteNonQuery(connection, commandType, commandText, commandParameters);
		}
	}

	/// <summary>
	/// Execute a stored procedure via a SqlCommand (that returns no resultset) against the database specified in 
	/// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
	/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
	/// </summary>
	/// <remarks>
	/// This method provides no access to output parameters or the stored procedure's return value parameter.
	/// 
	/// e.g.:  
	///  int result = ExecuteNonQuery(connString, "PublishOrders", 24, 36);
	/// </remarks>
	/// <param name="connectionString">A valid connection string for a SqlConnection</param>
	/// <param name="spName">The name of the stored prcedure</param>
	/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
	/// <returns>An int representing the number of rows affected by the command</returns>
	public static int ExecuteNonQuery(string connectionString, string spName, params object[] parameterValues)
	{
		if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		// If we receive parameter values, we need to figure out where they go
		if ((parameterValues != null) && (parameterValues.Length > 0))
		{
			// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
			SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

			// Assign the provided values to these parameters based on parameter order
			AssignParameterValues(commandParameters, parameterValues);

			// Call the overload that takes an array of SqlParameters
			return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);
		}
		else
		{
			// Otherwise we can just call the SP without params
			return ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);
		}
	}

	/// <summary>
	/// Execute a SqlCommand (that returns no resultset and takes no parameters) against the provided SqlConnection. 
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders");
	/// </remarks>
	/// <param name="connection">A valid SqlConnection</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <returns>An int representing the number of rows affected by the command</returns>
	public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText)
	{
		// Pass through the call providing null for the set of SqlParameters
		return ExecuteNonQuery(connection, commandType, commandText, (SqlParameter[]) null);
	}

	/// <summary>
	/// Execute a SqlCommand (that returns no resultset) against the specified SqlConnection 
	/// using the provided parameters.
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  int result = ExecuteNonQuery(conn, CommandType.StoredProcedure, "PublishOrders", new SqlParameter("@prodid", 24));
	/// </remarks>
	/// <param name="connection">A valid SqlConnection</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
	/// <returns>An int representing the number of rows affected by the command</returns>
	public static int ExecuteNonQuery(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
	{
		if (connection == null) throw new ArgumentNullException("connection");

		// Create a command and prepare it for execution
		SqlCommand cmd = new SqlCommand();
		bool mustCloseConnection = false;
		PrepareCommand(cmd, connection, (SqlTransaction) null, commandType, commandText, commandParameters, out mustCloseConnection);

		// Finally, execute the command
		int retval = cmd.ExecuteNonQuery();

		// Detach the SqlParameters from the command object, so they can be used again
		cmd.Parameters.Clear();
		if (mustCloseConnection)
			connection.Close();
		return retval;
	}

	/// <summary>
	/// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified SqlConnection 
	/// using the provided parameter values.  This method will query the database to discover the parameters for the 
	/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
	/// </summary>
	/// <remarks>
	/// This method provides no access to output parameters or the stored procedure's return value parameter.
	/// 
	/// e.g.:  
	///  int result = ExecuteNonQuery(conn, "PublishOrders", 24, 36);
	/// </remarks>
	/// <param name="connection">A valid SqlConnection</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
	/// <returns>An int representing the number of rows affected by the command</returns>
	public static int ExecuteNonQuery(SqlConnection connection, string spName, params object[] parameterValues)
	{
		if (connection == null) throw new ArgumentNullException("connection");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		// If we receive parameter values, we need to figure out where they go
		if ((parameterValues != null) && (parameterValues.Length > 0))
		{
			// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
			SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

			// Assign the provided values to these parameters based on parameter order
			AssignParameterValues(commandParameters, parameterValues);

			// Call the overload that takes an array of SqlParameters
			return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);
		}
		else
		{
			// Otherwise we can just call the SP without params
			return ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);
		}
	}

	/// <summary>
	/// Execute a SqlCommand (that returns no resultset and takes no parameters) against the provided SqlTransaction. 
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders");
	/// </remarks>
	/// <param name="transaction">A valid SqlTransaction</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <returns>An int representing the number of rows affected by the command</returns>
	public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText)
	{
		// Pass through the call providing null for the set of SqlParameters
		return ExecuteNonQuery(transaction, commandType, commandText, (SqlParameter[]) null);
	}

	/// <summary>
	/// Execute a SqlCommand (that returns no resultset) against the specified SqlTransaction
	/// using the provided parameters.
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
	/// </remarks>
	/// <param name="transaction">A valid SqlTransaction</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
	/// <returns>An int representing the number of rows affected by the command</returns>
	public static int ExecuteNonQuery(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
	{
		if (transaction == null) throw new ArgumentNullException("transaction");
		if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

		// Create a command and prepare it for execution
		SqlCommand cmd = new SqlCommand();
		bool mustCloseConnection = false;
		PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

		// Finally, execute the command
		int retval = cmd.ExecuteNonQuery();

		// Detach the SqlParameters from the command object, so they can be used again
		cmd.Parameters.Clear();
		return retval;
	}

	/// <summary>
	/// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified 
	/// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
	/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
	/// </summary>
	/// <remarks>
	/// This method provides no access to output parameters or the stored procedure's return value parameter.
	/// 
	/// e.g.:  
	///  int result = ExecuteNonQuery(conn, trans, "PublishOrders", 24, 36);
	/// </remarks>
	/// <param name="transaction">A valid SqlTransaction</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
	/// <returns>An int representing the number of rows affected by the command</returns>
	public static int ExecuteNonQuery(SqlTransaction transaction, string spName, params object[] parameterValues)
	{
		if (transaction == null) throw new ArgumentNullException("transaction");
		if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		// If we receive parameter values, we need to figure out where they go
		if ((parameterValues != null) && (parameterValues.Length > 0))
		{
			// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
			SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

			// Assign the provided values to these parameters based on parameter order
			AssignParameterValues(commandParameters, parameterValues);

			// Call the overload that takes an array of SqlParameters
			return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);
		}
		else
		{
			// Otherwise we can just call the SP without params
			return ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);
		}
	}

	#endregion ExecuteNonQuery

	#region ExecuteDataset

	/// <summary>
	/// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in 
	/// the connection string. 
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders");
	/// </remarks>
	/// <param name="connectionString">A valid connection string for a SqlConnection</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <returns>A dataset containing the resultset generated by the command</returns>
	public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText)
	{
		// Pass through the call providing null for the set of SqlParameters
		return ExecuteDataset(connectionString, commandType, commandText, (SqlParameter[]) null);
	}

	/// <summary>
	/// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string 
	/// using the provided parameters.
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  DataSet ds = ExecuteDataset(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
	/// </remarks>
	/// <param name="connectionString">A valid connection string for a SqlConnection</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
	/// <returns>A dataset containing the resultset generated by the command</returns>
	public static DataSet ExecuteDataset(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
	{
		if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");

		// Create & open a SqlConnection, and dispose of it after we are done
		using (SqlConnection connection = new SqlConnection(connectionString))
		{
			connection.Open();

			// Call the overload that takes a connection in place of the connection string
			return ExecuteDataset(connection, commandType, commandText, commandParameters);
		}
	}

	/// <summary>
	/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in 
	/// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
	/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
	/// </summary>
	/// <remarks>
	/// This method provides no access to output parameters or the stored procedure's return value parameter.
	/// 
	/// e.g.:  
	///  DataSet ds = ExecuteDataset(connString, "GetOrders", 24, 36);
	/// </remarks>
	/// <param name="connectionString">A valid connection string for a SqlConnection</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
	/// <returns>A dataset containing the resultset generated by the command</returns>
	public static DataSet ExecuteDataset(string connectionString, string spName, params object[] parameterValues)
	{
		if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		// If we receive parameter values, we need to figure out where they go
		if ((parameterValues != null) && (parameterValues.Length > 0))
		{
			// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
			SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

			// Assign the provided values to these parameters based on parameter order
			AssignParameterValues(commandParameters, parameterValues);

			// Call the overload that takes an array of SqlParameters
			return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);
		}
		else
		{
			// Otherwise we can just call the SP without params
			return ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);
		}
	}

	/// <summary>
	/// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection. 
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders");
	/// </remarks>
	/// <param name="connection">A valid SqlConnection</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <returns>A dataset containing the resultset generated by the command</returns>
	public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText)
	{
		// Pass through the call providing null for the set of SqlParameters
		return ExecuteDataset(connection, commandType, commandText, (SqlParameter[]) null);
	}

	/// <summary>
	/// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection 
	/// using the provided parameters.
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  DataSet ds = ExecuteDataset(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
	/// </remarks>
	/// <param name="connection">A valid SqlConnection</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
	/// <returns>A dataset containing the resultset generated by the command</returns>
	public static DataSet ExecuteDataset(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
	{
		if (connection == null) throw new ArgumentNullException("connection");

		// Create a command and prepare it for execution
		SqlCommand cmd = new SqlCommand();
		bool mustCloseConnection = false;
		PrepareCommand(cmd, connection, (SqlTransaction) null, commandType, commandText, commandParameters, out mustCloseConnection);

		// Create the DataAdapter & DataSet
		using (SqlDataAdapter da = new SqlDataAdapter(cmd))
		{
			DataSet ds = new DataSet();

			// Fill the DataSet using default values for DataTable names, etc
			da.Fill(ds);

			// Detach the SqlParameters from the command object, so they can be used again
			cmd.Parameters.Clear();

			if (mustCloseConnection)
				connection.Close();

			// Return the dataset
			return ds;
		}
	}

	/// <summary>
	/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 
	/// using the provided parameter values.  This method will query the database to discover the parameters for the 
	/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
	/// </summary>
	/// <remarks>
	/// This method provides no access to output parameters or the stored procedure's return value parameter.
	/// 
	/// e.g.:  
	///  DataSet ds = ExecuteDataset(conn, "GetOrders", 24, 36);
	/// </remarks>
	/// <param name="connection">A valid SqlConnection</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
	/// <returns>A dataset containing the resultset generated by the command</returns>
	public static DataSet ExecuteDataset(SqlConnection connection, string spName, params object[] parameterValues)
	{
		if (connection == null) throw new ArgumentNullException("connection");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		// If we receive parameter values, we need to figure out where they go
		if ((parameterValues != null) && (parameterValues.Length > 0))
		{
			// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
			SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

			// Assign the provided values to these parameters based on parameter order
			AssignParameterValues(commandParameters, parameterValues);

			// Call the overload that takes an array of SqlParameters
			return ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);
		}
		else
		{
			// Otherwise we can just call the SP without params
			return ExecuteDataset(connection, CommandType.StoredProcedure, spName);
		}
	}

	/// <summary>
	/// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction. 
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders");
	/// </remarks>
	/// <param name="transaction">A valid SqlTransaction</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <returns>A dataset containing the resultset generated by the command</returns>
	public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText)
	{
		// Pass through the call providing null for the set of SqlParameters
		return ExecuteDataset(transaction, commandType, commandText, (SqlParameter[]) null);
	}

	/// <summary>
	/// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
	/// using the provided parameters.
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  DataSet ds = ExecuteDataset(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
	/// </remarks>
	/// <param name="transaction">A valid SqlTransaction</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
	/// <returns>A dataset containing the resultset generated by the command</returns>
	public static DataSet ExecuteDataset(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
	{
		if (transaction == null) throw new ArgumentNullException("transaction");
		if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

		// Create a command and prepare it for execution
		SqlCommand cmd = new SqlCommand();
		bool mustCloseConnection = false;
		PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

		// Create the DataAdapter & DataSet
		using (SqlDataAdapter da = new SqlDataAdapter(cmd))
		{
			DataSet ds = new DataSet();

			// Fill the DataSet using default values for DataTable names, etc
			da.Fill(ds);

			// Detach the SqlParameters from the command object, so they can be used again
			cmd.Parameters.Clear();

			// Return the dataset
			return ds;
		}
	}

	/// <summary>
	/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified 
	/// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
	/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
	/// </summary>
	/// <remarks>
	/// This method provides no access to output parameters or the stored procedure's return value parameter.
	/// 
	/// e.g.:  
	///  DataSet ds = ExecuteDataset(trans, "GetOrders", 24, 36);
	/// </remarks>
	/// <param name="transaction">A valid SqlTransaction</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
	/// <returns>A dataset containing the resultset generated by the command</returns>
	public static DataSet ExecuteDataset(SqlTransaction transaction, string spName, params object[] parameterValues)
	{
		if (transaction == null) throw new ArgumentNullException("transaction");
		if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		// If we receive parameter values, we need to figure out where they go
		if ((parameterValues != null) && (parameterValues.Length > 0))
		{
			// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
			SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

			// Assign the provided values to these parameters based on parameter order
			AssignParameterValues(commandParameters, parameterValues);

			// Call the overload that takes an array of SqlParameters
			return ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);
		}
		else
		{
			// Otherwise we can just call the SP without params
			return ExecuteDataset(transaction, CommandType.StoredProcedure, spName);
		}
	}

	#endregion ExecuteDataset

	#region ExecuteReader

	/// <summary>
	/// This enum is used to indicate whether the connection was provided by the caller, or created by SqlHelper, so that
	/// we can set the appropriate CommandBehavior when calling ExecuteReader()
	/// </summary>
	private enum SqlConnectionOwnership
	{
		/// <summary>Connection is owned and managed by SqlHelper</summary>
		Internal,
		/// <summary>Connection is owned and managed by the caller</summary>
		External
	}

	/// <summary>
	/// Create and prepare a SqlCommand, and call ExecuteReader with the appropriate CommandBehavior.
	/// </summary>
	/// <remarks>
	/// If we created and opened the connection, we want the connection to be closed when the DataReader is closed.
	/// 
	/// If the caller provided the connection, we want to leave it to them to manage.
	/// </remarks>
	/// <param name="connection">A valid SqlConnection, on which to execute this command</param>
	/// <param name="transaction">A valid SqlTransaction, or 'null'</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <param name="commandParameters">An array of SqlParameters to be associated with the command or 'null' if no parameters are required</param>
	/// <param name="connectionOwnership">Indicates whether the connection parameter was provided by the caller, or created by SqlHelper</param>
	/// <returns>SqlDataReader containing the results of the command</returns>
	private static SqlDataReader ExecuteReader(SqlConnection connection, SqlTransaction transaction, CommandType commandType, string commandText, SqlParameter[] commandParameters, SqlConnectionOwnership connectionOwnership)
	{
		if (connection == null) throw new ArgumentNullException("connection");

		bool mustCloseConnection = false;
		// Create a command and prepare it for execution
		SqlCommand cmd = new SqlCommand();
		try
		{
			PrepareCommand(cmd, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

			// Create a reader
			SqlDataReader dataReader;

			// Call ExecuteReader with the appropriate CommandBehavior
			if (connectionOwnership == SqlConnectionOwnership.External)
			{
				dataReader = cmd.ExecuteReader();
			}
			else
			{
				dataReader = cmd.ExecuteReader(CommandBehavior.CloseConnection);
			}

			// Detach the SqlParameters from the command object, so they can be used again.
			// HACK: There is a problem here, the output parameter values are fletched 
			// when the reader is closed, so if the parameters are detached from the command
			// then the SqlReader cant set its values. 
			// When this happen, the parameters cant be used again in other command.
			bool canClear = true;
			foreach (SqlParameter commandParameter in cmd.Parameters)
			{
				if (commandParameter.Direction != ParameterDirection.Input)
					canClear = false;
			}

			if (canClear)
			{
				cmd.Parameters.Clear();
			}

			return dataReader;
		}
		catch
		{
			if (mustCloseConnection)
				connection.Close();
			throw;
		}
	}

	/// <summary>
	/// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in 
	/// the connection string. 
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders");
	/// </remarks>
	/// <param name="connectionString">A valid connection string for a SqlConnection</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <returns>A SqlDataReader containing the resultset generated by the command</returns>
	public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText)
	{
		// Pass through the call providing null for the set of SqlParameters
		return ExecuteReader(connectionString, commandType, commandText, (SqlParameter[]) null);
	}

	/// <summary>
	/// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string 
	/// using the provided parameters.
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  SqlDataReader dr = ExecuteReader(connString, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
	/// </remarks>
	/// <param name="connectionString">A valid connection string for a SqlConnection</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
	/// <returns>A SqlDataReader containing the resultset generated by the command</returns>
	public static SqlDataReader ExecuteReader(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
	{
		if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
		SqlConnection connection = null;
		try
		{
			connection = new SqlConnection(connectionString);
			connection.Open();

			// Call the private overload that takes an internally owned connection in place of the connection string
			return ExecuteReader(connection, null, commandType, commandText, commandParameters, SqlConnectionOwnership.Internal);
		}
		catch
		{
			// If we fail to return the SqlDatReader, we need to close the connection ourselves
			if (connection != null) connection.Close();
			throw;
		}

	}

	/// <summary>
	/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in 
	/// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
	/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
	/// </summary>
	/// <remarks>
	/// This method provides no access to output parameters or the stored procedure's return value parameter.
	/// 
	/// e.g.:  
	///  SqlDataReader dr = ExecuteReader(connString, "GetOrders", 24, 36);
	/// </remarks>
	/// <param name="connectionString">A valid connection string for a SqlConnection</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
	/// <returns>A SqlDataReader containing the resultset generated by the command</returns>
	public static SqlDataReader ExecuteReader(string connectionString, string spName, params object[] parameterValues)
	{
		if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		// If we receive parameter values, we need to figure out where they go
		if ((parameterValues != null) && (parameterValues.Length > 0))
		{
			SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

			AssignParameterValues(commandParameters, parameterValues);

			return ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);
		}
		else
		{
			// Otherwise we can just call the SP without params
			return ExecuteReader(connectionString, CommandType.StoredProcedure, spName);
		}
	}

	/// <summary>
	/// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection. 
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders");
	/// </remarks>
	/// <param name="connection">A valid SqlConnection</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <returns>A SqlDataReader containing the resultset generated by the command</returns>
	public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText)
	{
		// Pass through the call providing null for the set of SqlParameters
		return ExecuteReader(connection, commandType, commandText, (SqlParameter[]) null);
	}

	/// <summary>
	/// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection 
	/// using the provided parameters.
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  SqlDataReader dr = ExecuteReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
	/// </remarks>
	/// <param name="connection">A valid SqlConnection</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
	/// <returns>A SqlDataReader containing the resultset generated by the command</returns>
	public static SqlDataReader ExecuteReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
	{
		// Pass through the call to the private overload using a null transaction value and an externally owned connection
		return ExecuteReader(connection, (SqlTransaction) null, commandType, commandText, commandParameters, SqlConnectionOwnership.External);
	}

	/// <summary>
	/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 
	/// using the provided parameter values.  This method will query the database to discover the parameters for the 
	/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
	/// </summary>
	/// <remarks>
	/// This method provides no access to output parameters or the stored procedure's return value parameter.
	/// 
	/// e.g.:  
	///  SqlDataReader dr = ExecuteReader(conn, "GetOrders", 24, 36);
	/// </remarks>
	/// <param name="connection">A valid SqlConnection</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
	/// <returns>A SqlDataReader containing the resultset generated by the command</returns>
	public static SqlDataReader ExecuteReader(SqlConnection connection, string spName, params object[] parameterValues)
	{
		if (connection == null) throw new ArgumentNullException("connection");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		// If we receive parameter values, we need to figure out where they go
		if ((parameterValues != null) && (parameterValues.Length > 0))
		{
			SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

			AssignParameterValues(commandParameters, parameterValues);

			return ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);
		}
		else
		{
			// Otherwise we can just call the SP without params
			return ExecuteReader(connection, CommandType.StoredProcedure, spName);
		}
	}

	/// <summary>
	/// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction. 
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders");
	/// </remarks>
	/// <param name="transaction">A valid SqlTransaction</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <returns>A SqlDataReader containing the resultset generated by the command</returns>
	public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText)
	{
		// Pass through the call providing null for the set of SqlParameters
		return ExecuteReader(transaction, commandType, commandText, (SqlParameter[]) null);
	}

	/// <summary>
	/// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
	/// using the provided parameters.
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///   SqlDataReader dr = ExecuteReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
	/// </remarks>
	/// <param name="transaction">A valid SqlTransaction</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
	/// <returns>A SqlDataReader containing the resultset generated by the command</returns>
	public static SqlDataReader ExecuteReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
	{
		if (transaction == null) throw new ArgumentNullException("transaction");
		if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

		// Pass through to private overload, indicating that the connection is owned by the caller
		return ExecuteReader(transaction.Connection, transaction, commandType, commandText, commandParameters, SqlConnectionOwnership.External);
	}

	/// <summary>
	/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified
	/// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
	/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
	/// </summary>
	/// <remarks>
	/// This method provides no access to output parameters or the stored procedure's return value parameter.
	/// 
	/// e.g.:  
	///  SqlDataReader dr = ExecuteReader(trans, "GetOrders", 24, 36);
	/// </remarks>
	/// <param name="transaction">A valid SqlTransaction</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
	/// <returns>A SqlDataReader containing the resultset generated by the command</returns>
	public static SqlDataReader ExecuteReader(SqlTransaction transaction, string spName, params object[] parameterValues)
	{
		if (transaction == null) throw new ArgumentNullException("transaction");
		if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		// If we receive parameter values, we need to figure out where they go
		if ((parameterValues != null) && (parameterValues.Length > 0))
		{
			SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

			AssignParameterValues(commandParameters, parameterValues);

			return ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
		}
		else
		{
			// Otherwise we can just call the SP without params
			return ExecuteReader(transaction, CommandType.StoredProcedure, spName);
		}
	}

	#endregion ExecuteReader

	#region ExecuteScalar

	/// <summary>
	/// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the database specified in 
	/// the connection string. 
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount");
	/// </remarks>
	/// <param name="connectionString">A valid connection string for a SqlConnection</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
	public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText)
	{
		// Pass through the call providing null for the set of SqlParameters
		return ExecuteScalar(connectionString, commandType, commandText, (SqlParameter[]) null);
	}

	/// <summary>
	/// Execute a SqlCommand (that returns a 1x1 resultset) against the database specified in the connection string 
	/// using the provided parameters.
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  int orderCount = (int)ExecuteScalar(connString, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
	/// </remarks>
	/// <param name="connectionString">A valid connection string for a SqlConnection</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
	/// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
	public static object ExecuteScalar(string connectionString, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
	{
		if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
		// Create & open a SqlConnection, and dispose of it after we are done
		using (SqlConnection connection = new SqlConnection(connectionString))
		{
			connection.Open();

			// Call the overload that takes a connection in place of the connection string
			return ExecuteScalar(connection, commandType, commandText, commandParameters);
		}
	}

	/// <summary>
	/// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the database specified in 
	/// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
	/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
	/// </summary>
	/// <remarks>
	/// This method provides no access to output parameters or the stored procedure's return value parameter.
	/// 
	/// e.g.:  
	///  int orderCount = (int)ExecuteScalar(connString, "GetOrderCount", 24, 36);
	/// </remarks>
	/// <param name="connectionString">A valid connection string for a SqlConnection</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
	/// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
	public static object ExecuteScalar(string connectionString, string spName, params object[] parameterValues)
	{
		if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		// If we receive parameter values, we need to figure out where they go
		if ((parameterValues != null) && (parameterValues.Length > 0))
		{
			// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
			SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

			// Assign the provided values to these parameters based on parameter order
			AssignParameterValues(commandParameters, parameterValues);

			// Call the overload that takes an array of SqlParameters
			return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);
		}
		else
		{
			// Otherwise we can just call the SP without params
			return ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);
		}
	}

	/// <summary>
	/// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the provided SqlConnection. 
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount");
	/// </remarks>
	/// <param name="connection">A valid SqlConnection</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
	public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText)
	{
		// Pass through the call providing null for the set of SqlParameters
		return ExecuteScalar(connection, commandType, commandText, (SqlParameter[]) null);
	}

	/// <summary>
	/// Execute a SqlCommand (that returns a 1x1 resultset) against the specified SqlConnection 
	/// using the provided parameters.
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  int orderCount = (int)ExecuteScalar(conn, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
	/// </remarks>
	/// <param name="connection">A valid SqlConnection</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
	/// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
	public static object ExecuteScalar(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
	{
		if (connection == null) throw new ArgumentNullException("connection");

		// Create a command and prepare it for execution
		SqlCommand cmd = new SqlCommand();

		bool mustCloseConnection = false;
		PrepareCommand(cmd, connection, (SqlTransaction) null, commandType, commandText, commandParameters, out mustCloseConnection);

		// Execute the command & return the results
		object retval = cmd.ExecuteScalar();

		// Detach the SqlParameters from the command object, so they can be used again
		cmd.Parameters.Clear();

		if (mustCloseConnection)
			connection.Close();

		return retval;
	}

	/// <summary>
	/// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified SqlConnection 
	/// using the provided parameter values.  This method will query the database to discover the parameters for the 
	/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
	/// </summary>
	/// <remarks>
	/// This method provides no access to output parameters or the stored procedure's return value parameter.
	/// 
	/// e.g.:  
	///  int orderCount = (int)ExecuteScalar(conn, "GetOrderCount", 24, 36);
	/// </remarks>
	/// <param name="connection">A valid SqlConnection</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
	/// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
	public static object ExecuteScalar(SqlConnection connection, string spName, params object[] parameterValues)
	{
		if (connection == null) throw new ArgumentNullException("connection");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		// If we receive parameter values, we need to figure out where they go
		if ((parameterValues != null) && (parameterValues.Length > 0))
		{
			// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
			SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

			// Assign the provided values to these parameters based on parameter order
			AssignParameterValues(commandParameters, parameterValues);

			// Call the overload that takes an array of SqlParameters
			return ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);
		}
		else
		{
			// Otherwise we can just call the SP without params
			return ExecuteScalar(connection, CommandType.StoredProcedure, spName);
		}
	}

	/// <summary>
	/// Execute a SqlCommand (that returns a 1x1 resultset and takes no parameters) against the provided SqlTransaction. 
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount");
	/// </remarks>
	/// <param name="transaction">A valid SqlTransaction</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
	public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText)
	{
		// Pass through the call providing null for the set of SqlParameters
		return ExecuteScalar(transaction, commandType, commandText, (SqlParameter[]) null);
	}

	/// <summary>
	/// Execute a SqlCommand (that returns a 1x1 resultset) against the specified SqlTransaction
	/// using the provided parameters.
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  int orderCount = (int)ExecuteScalar(trans, CommandType.StoredProcedure, "GetOrderCount", new SqlParameter("@prodid", 24));
	/// </remarks>
	/// <param name="transaction">A valid SqlTransaction</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
	/// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
	public static object ExecuteScalar(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
	{
		if (transaction == null) throw new ArgumentNullException("transaction");
		if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

		// Create a command and prepare it for execution
		SqlCommand cmd = new SqlCommand();
		bool mustCloseConnection = false;
		PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

		// Execute the command & return the results
		object retval = cmd.ExecuteScalar();

		// Detach the SqlParameters from the command object, so they can be used again
		cmd.Parameters.Clear();
		return retval;
	}

	/// <summary>
	/// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified
	/// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
	/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
	/// </summary>
	/// <remarks>
	/// This method provides no access to output parameters or the stored procedure's return value parameter.
	/// 
	/// e.g.:  
	///  int orderCount = (int)ExecuteScalar(trans, "GetOrderCount", 24, 36);
	/// </remarks>
	/// <param name="transaction">A valid SqlTransaction</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
	/// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
	public static object ExecuteScalar(SqlTransaction transaction, string spName, params object[] parameterValues)
	{
		if (transaction == null) throw new ArgumentNullException("transaction");
		if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		// If we receive parameter values, we need to figure out where they go
		if ((parameterValues != null) && (parameterValues.Length > 0))
		{
			// PPull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
			SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

			// Assign the provided values to these parameters based on parameter order
			AssignParameterValues(commandParameters, parameterValues);

			// Call the overload that takes an array of SqlParameters
			return ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);
		}
		else
		{
			// Otherwise we can just call the SP without params
			return ExecuteScalar(transaction, CommandType.StoredProcedure, spName);
		}
	}

	#endregion ExecuteScalar	

	#region ExecuteXmlReader

	/// <summary>
	/// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection. 
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders");
	/// </remarks>
	/// <param name="connection">A valid SqlConnection</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command using "FOR XML AUTO"</param>
	/// <returns>An XmlReader containing the resultset generated by the command</returns>
	public static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText)
	{
		// Pass through the call providing null for the set of SqlParameters
		return ExecuteXmlReader(connection, commandType, commandText, (SqlParameter[]) null);
	}

	/// <summary>
	/// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection 
	/// using the provided parameters.
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  XmlReader r = ExecuteXmlReader(conn, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
	/// </remarks>
	/// <param name="connection">A valid SqlConnection</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command using "FOR XML AUTO"</param>
	/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
	/// <returns>An XmlReader containing the resultset generated by the command</returns>
	public static XmlReader ExecuteXmlReader(SqlConnection connection, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
	{
		if (connection == null) throw new ArgumentNullException("connection");

		bool mustCloseConnection = false;
		// Create a command and prepare it for execution
		SqlCommand cmd = new SqlCommand();
		try
		{
			PrepareCommand(cmd, connection, (SqlTransaction) null, commandType, commandText, commandParameters, out mustCloseConnection);

			// Create the DataAdapter & DataSet
			XmlReader retval = cmd.ExecuteXmlReader();

			// Detach the SqlParameters from the command object, so they can be used again
			cmd.Parameters.Clear();

			return retval;
		}
		catch
		{
			if (mustCloseConnection)
				connection.Close();
			throw;
		}
	}

	/// <summary>
	/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 
	/// using the provided parameter values.  This method will query the database to discover the parameters for the 
	/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
	/// </summary>
	/// <remarks>
	/// This method provides no access to output parameters or the stored procedure's return value parameter.
	/// 
	/// e.g.:  
	///  XmlReader r = ExecuteXmlReader(conn, "GetOrders", 24, 36);
	/// </remarks>
	/// <param name="connection">A valid SqlConnection</param>
	/// <param name="spName">The name of the stored procedure using "FOR XML AUTO"</param>
	/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
	/// <returns>An XmlReader containing the resultset generated by the command</returns>
	public static XmlReader ExecuteXmlReader(SqlConnection connection, string spName, params object[] parameterValues)
	{
		if (connection == null) throw new ArgumentNullException("connection");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		// If we receive parameter values, we need to figure out where they go
		if ((parameterValues != null) && (parameterValues.Length > 0))
		{
			// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
			SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

			// Assign the provided values to these parameters based on parameter order
			AssignParameterValues(commandParameters, parameterValues);

			// Call the overload that takes an array of SqlParameters
			return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, commandParameters);
		}
		else
		{
			// Otherwise we can just call the SP without params
			return ExecuteXmlReader(connection, CommandType.StoredProcedure, spName);
		}
	}

	/// <summary>
	/// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction. 
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders");
	/// </remarks>
	/// <param name="transaction">A valid SqlTransaction</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command using "FOR XML AUTO"</param>
	/// <returns>An XmlReader containing the resultset generated by the command</returns>
	public static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText)
	{
		// Pass through the call providing null for the set of SqlParameters
		return ExecuteXmlReader(transaction, commandType, commandText, (SqlParameter[]) null);
	}

	/// <summary>
	/// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
	/// using the provided parameters.
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  XmlReader r = ExecuteXmlReader(trans, CommandType.StoredProcedure, "GetOrders", new SqlParameter("@prodid", 24));
	/// </remarks>
	/// <param name="transaction">A valid SqlTransaction</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command using "FOR XML AUTO"</param>
	/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
	/// <returns>An XmlReader containing the resultset generated by the command</returns>
	public static XmlReader ExecuteXmlReader(SqlTransaction transaction, CommandType commandType, string commandText, params SqlParameter[] commandParameters)
	{
		if (transaction == null) throw new ArgumentNullException("transaction");
		if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");

		// Create a command and prepare it for execution
		SqlCommand cmd = new SqlCommand();
		bool mustCloseConnection = false;
		PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

		// Create the DataAdapter & DataSet
		XmlReader retval = cmd.ExecuteXmlReader();

		// Detach the SqlParameters from the command object, so they can be used again
		cmd.Parameters.Clear();
		return retval;
	}

	/// <summary>
	/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified 
	/// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
	/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
	/// </summary>
	/// <remarks>
	/// This method provides no access to output parameters or the stored procedure's return value parameter.
	/// 
	/// e.g.:  
	///  XmlReader r = ExecuteXmlReader(trans, "GetOrders", 24, 36);
	/// </remarks>
	/// <param name="transaction">A valid SqlTransaction</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
	/// <returns>A dataset containing the resultset generated by the command</returns>
	public static XmlReader ExecuteXmlReader(SqlTransaction transaction, string spName, params object[] parameterValues)
	{
		if (transaction == null) throw new ArgumentNullException("transaction");
		if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		// If we receive parameter values, we need to figure out where they go
		if ((parameterValues != null) && (parameterValues.Length > 0))
		{
			// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
			SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

			// Assign the provided values to these parameters based on parameter order
			AssignParameterValues(commandParameters, parameterValues);

			// Call the overload that takes an array of SqlParameters
			return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
		}
		else
		{
			// Otherwise we can just call the SP without params
			return ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName);
		}
	}

	#endregion ExecuteXmlReader

	#region FillDataset

	/// <summary>
	/// Execute a SqlCommand (that returns a resultset and takes no parameters) against the database specified in 
	/// the connection string. 
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
	/// </remarks>
	/// <param name="connectionString">A valid connection string for a SqlConnection</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
	/// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
	/// by a user defined name (probably the actual table name)</param>
	public static void FillDataset(string connectionString, CommandType commandType, string commandText, DataSet dataSet, string[] tableNames)
	{
		if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
		if (dataSet == null) throw new ArgumentNullException("dataSet");

		// Create & open a SqlConnection, and dispose of it after we are done
		using (SqlConnection connection = new SqlConnection(connectionString))
		{
			connection.Open();

			// Call the overload that takes a connection in place of the connection string
			FillDataset(connection, commandType, commandText, dataSet, tableNames);
		}
	}

	/// <summary>
	/// Execute a SqlCommand (that returns a resultset) against the database specified in the connection string 
	/// using the provided parameters.
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
	/// </remarks>
	/// <param name="connectionString">A valid connection string for a SqlConnection</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
	/// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
	/// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
	/// by a user defined name (probably the actual table name)
	/// </param>
	public static void FillDataset(string connectionString, CommandType commandType,
	                               string commandText, DataSet dataSet, string[] tableNames,
	                               params SqlParameter[] commandParameters)
	{
		if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
		if (dataSet == null) throw new ArgumentNullException("dataSet");
		// Create & open a SqlConnection, and dispose of it after we are done
		using (SqlConnection connection = new SqlConnection(connectionString))
		{
			connection.Open();

			// Call the overload that takes a connection in place of the connection string
			FillDataset(connection, commandType, commandText, dataSet, tableNames, commandParameters);
		}
	}

	/// <summary>
	/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in 
	/// the connection string using the provided parameter values.  This method will query the database to discover the parameters for the 
	/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
	/// </summary>
	/// <remarks>
	/// This method provides no access to output parameters or the stored procedure's return value parameter.
	/// 
	/// e.g.:  
	///  FillDataset(connString, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, 24);
	/// </remarks>
	/// <param name="connectionString">A valid connection string for a SqlConnection</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
	/// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
	/// by a user defined name (probably the actual table name)
	/// </param>    
	/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
	public static void FillDataset(string connectionString, string spName,
	                               DataSet dataSet, string[] tableNames,
	                               params object[] parameterValues)
	{
		if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
		if (dataSet == null) throw new ArgumentNullException("dataSet");
		// Create & open a SqlConnection, and dispose of it after we are done
		using (SqlConnection connection = new SqlConnection(connectionString))
		{
			connection.Open();

			// Call the overload that takes a connection in place of the connection string
			FillDataset(connection, spName, dataSet, tableNames, parameterValues);
		}
	}

	/// <summary>
	/// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlConnection. 
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
	/// </remarks>
	/// <param name="connection">A valid SqlConnection</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
	/// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
	/// by a user defined name (probably the actual table name)
	/// </param>    
	public static void FillDataset(SqlConnection connection, CommandType commandType,
	                               string commandText, DataSet dataSet, string[] tableNames)
	{
		FillDataset(connection, commandType, commandText, dataSet, tableNames, null);
	}

	/// <summary>
	/// Execute a SqlCommand (that returns a resultset) against the specified SqlConnection 
	/// using the provided parameters.
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  FillDataset(conn, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
	/// </remarks>
	/// <param name="connection">A valid SqlConnection</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
	/// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
	/// by a user defined name (probably the actual table name)
	/// </param>
	/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
	public static void FillDataset(SqlConnection connection, CommandType commandType,
	                               string commandText, DataSet dataSet, string[] tableNames,
	                               params SqlParameter[] commandParameters)
	{
		FillDataset(connection, null, commandType, commandText, dataSet, tableNames, commandParameters);
	}

	/// <summary>
	/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 
	/// using the provided parameter values.  This method will query the database to discover the parameters for the 
	/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
	/// </summary>
	/// <remarks>
	/// This method provides no access to output parameters or the stored procedure's return value parameter.
	/// 
	/// e.g.:  
	///  FillDataset(conn, "GetOrders", ds, new string[] {"orders"}, 24, 36);
	/// </remarks>
	/// <param name="connection">A valid SqlConnection</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
	/// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
	/// by a user defined name (probably the actual table name)
	/// </param>
	/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
	public static void FillDataset(SqlConnection connection, string spName,
	                               DataSet dataSet, string[] tableNames,
	                               params object[] parameterValues)
	{
		if (connection == null) throw new ArgumentNullException("connection");
		if (dataSet == null) throw new ArgumentNullException("dataSet");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		// If we receive parameter values, we need to figure out where they go
		if ((parameterValues != null) && (parameterValues.Length > 0))
		{
			// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
			SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

			// Assign the provided values to these parameters based on parameter order
			AssignParameterValues(commandParameters, parameterValues);

			// Call the overload that takes an array of SqlParameters
			FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames, commandParameters);
		}
		else
		{
			// Otherwise we can just call the SP without params
			FillDataset(connection, CommandType.StoredProcedure, spName, dataSet, tableNames);
		}
	}

	/// <summary>
	/// Execute a SqlCommand (that returns a resultset and takes no parameters) against the provided SqlTransaction. 
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"});
	/// </remarks>
	/// <param name="transaction">A valid SqlTransaction</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
	/// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
	/// by a user defined name (probably the actual table name)
	/// </param>
	public static void FillDataset(SqlTransaction transaction, CommandType commandType,
	                               string commandText,
	                               DataSet dataSet, string[] tableNames)
	{
		FillDataset(transaction, commandType, commandText, dataSet, tableNames, null);
	}

	/// <summary>
	/// Execute a SqlCommand (that returns a resultset) against the specified SqlTransaction
	/// using the provided parameters.
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  FillDataset(trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
	/// </remarks>
	/// <param name="transaction">A valid SqlTransaction</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
	/// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
	/// by a user defined name (probably the actual table name)
	/// </param>
	/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
	public static void FillDataset(SqlTransaction transaction, CommandType commandType,
	                               string commandText, DataSet dataSet, string[] tableNames,
	                               params SqlParameter[] commandParameters)
	{
		FillDataset(transaction.Connection, transaction, commandType, commandText, dataSet, tableNames, commandParameters);
	}

	/// <summary>
	/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified 
	/// SqlTransaction using the provided parameter values.  This method will query the database to discover the parameters for the 
	/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
	/// </summary>
	/// <remarks>
	/// This method provides no access to output parameters or the stored procedure's return value parameter.
	/// 
	/// e.g.:  
	///  FillDataset(trans, "GetOrders", ds, new string[]{"orders"}, 24, 36);
	/// </remarks>
	/// <param name="transaction">A valid SqlTransaction</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
	/// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
	/// by a user defined name (probably the actual table name)
	/// </param>
	/// <param name="parameterValues">An array of objects to be assigned as the input values of the stored procedure</param>
	public static void FillDataset(SqlTransaction transaction, string spName,
	                               DataSet dataSet, string[] tableNames,
	                               params object[] parameterValues)
	{
		if (transaction == null) throw new ArgumentNullException("transaction");
		if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
		if (dataSet == null) throw new ArgumentNullException("dataSet");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		// If we receive parameter values, we need to figure out where they go
		if ((parameterValues != null) && (parameterValues.Length > 0))
		{
			// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
			SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

			// Assign the provided values to these parameters based on parameter order
			AssignParameterValues(commandParameters, parameterValues);

			// Call the overload that takes an array of SqlParameters
			FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames, commandParameters);
		}
		else
		{
			// Otherwise we can just call the SP without params
			FillDataset(transaction, CommandType.StoredProcedure, spName, dataSet, tableNames);
		}
	}

	/// <summary>
	/// Private helper method that execute a SqlCommand (that returns a resultset) against the specified SqlTransaction and SqlConnection
	/// using the provided parameters.
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  FillDataset(conn, trans, CommandType.StoredProcedure, "GetOrders", ds, new string[] {"orders"}, new SqlParameter("@prodid", 24));
	/// </remarks>
	/// <param name="connection">A valid SqlConnection</param>
	/// <param name="transaction">A valid SqlTransaction</param>
	/// <param name="commandType">The CommandType (stored procedure, text, etc.)</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <param name="dataSet">A dataset wich will contain the resultset generated by the command</param>
	/// <param name="tableNames">This array will be used to create table mappings allowing the DataTables to be referenced
	/// by a user defined name (probably the actual table name)
	/// </param>
	/// <param name="commandParameters">An array of SqlParamters used to execute the command</param>
	private static void FillDataset(SqlConnection connection, SqlTransaction transaction, CommandType commandType,
	                                string commandText, DataSet dataSet, string[] tableNames,
	                                params SqlParameter[] commandParameters)
	{
		if (connection == null) throw new ArgumentNullException("connection");
		if (dataSet == null) throw new ArgumentNullException("dataSet");

		// Create a command and prepare it for execution
		SqlCommand command = new SqlCommand();
		bool mustCloseConnection = false;
		PrepareCommand(command, connection, transaction, commandType, commandText, commandParameters, out mustCloseConnection);

		// Create the DataAdapter & DataSet
		using (SqlDataAdapter dataAdapter = new SqlDataAdapter(command))
		{
			// Add the table mappings specified by the user
			if (tableNames != null && tableNames.Length > 0)
			{
				string tableName = "Table";
				for (int index = 0; index < tableNames.Length; index++)
				{
					if (tableNames[index] == null || tableNames[index].Length == 0) throw new ArgumentException("The tableNames parameter must contain a list of tables, a value was provided as null or empty string.", "tableNames");
					dataAdapter.TableMappings.Add(tableName, tableNames[index]);
					tableName += (index + 1).ToString();
				}
			}

			// Fill the DataSet using default values for DataTable names, etc
			dataAdapter.Fill(dataSet);

			// Detach the SqlParameters from the command object, so they can be used again
			command.Parameters.Clear();
		}

		if (mustCloseConnection)
			connection.Close();
	}

	#endregion

	#region UpdateDataset

	/// <summary>
	/// Executes the respective command for each inserted, updated, or deleted row in the DataSet.
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  UpdateDataset(conn, insertCommand, deleteCommand, updateCommand, dataSet, "Order");
	/// </remarks>
	/// <param name="insertCommand">A valid transact-SQL statement or stored procedure to insert new records into the data source</param>
	/// <param name="deleteCommand">A valid transact-SQL statement or stored procedure to delete records from the data source</param>
	/// <param name="updateCommand">A valid transact-SQL statement or stored procedure used to update records in the data source</param>
	/// <param name="dataSet">The DataSet used to update the data source</param>
	/// <param name="tableName">The DataTable used to update the data source.</param>
	public static void UpdateDataset(SqlCommand insertCommand, SqlCommand deleteCommand, SqlCommand updateCommand, DataSet dataSet, string tableName)
	{
		if (insertCommand == null) throw new ArgumentNullException("insertCommand");
		if (deleteCommand == null) throw new ArgumentNullException("deleteCommand");
		if (updateCommand == null) throw new ArgumentNullException("updateCommand");
		if (tableName == null || tableName.Length == 0) throw new ArgumentNullException("tableName");

		// Create a SqlDataAdapter, and dispose of it after we are done
		using (SqlDataAdapter dataAdapter = new SqlDataAdapter())
		{
			// Set the data adapter commands
			dataAdapter.UpdateCommand = updateCommand;
			dataAdapter.InsertCommand = insertCommand;
			dataAdapter.DeleteCommand = deleteCommand;

			// Update the dataset changes in the data source
			dataAdapter.Update(dataSet, tableName);

			// Commit all the changes made to the DataSet
			dataSet.AcceptChanges();
		}
	}

	#endregion

	#region CreateCommand

	/// <summary>
	/// Simplify the creation of a Sql command object by allowing
	/// a stored procedure and optional parameters to be provided
	/// </summary>
	/// <remarks>
	/// e.g.:  
	///  SqlCommand command = CreateCommand(conn, "AddCustomer", "CustomerID", "CustomerName");
	/// </remarks>
	/// <param name="connection">A valid SqlConnection object</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="sourceColumns">An array of string to be assigned as the source columns of the stored procedure parameters</param>
	/// <returns>A valid SqlCommand object</returns>
	public static SqlCommand CreateCommand(SqlConnection connection, string spName, params string[] sourceColumns)
	{
		if (connection == null) throw new ArgumentNullException("connection");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		// Create a SqlCommand
		SqlCommand cmd = new SqlCommand(spName, connection);
		cmd.CommandType = CommandType.StoredProcedure;

		// If we receive parameter values, we need to figure out where they go
		if ((sourceColumns != null) && (sourceColumns.Length > 0))
		{
			// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
			SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

			// Assign the provided source columns to these parameters based on parameter order
			for (int index = 0; index < sourceColumns.Length; index++)
				commandParameters[index].SourceColumn = sourceColumns[index];

			// Attach the discovered parameters to the SqlCommand object
			AttachParameters(cmd, commandParameters);
		}

		return cmd;
	}

	#endregion

	#region ExecuteNonQueryTypedParams

	/// <summary>
	/// Execute a stored procedure via a SqlCommand (that returns no resultset) against the database specified in 
	/// the connection string using the dataRow column values as the stored procedure's parameters values.
	/// This method will query the database to discover the parameters for the 
	/// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
	/// </summary>
	/// <param name="connectionString">A valid connection string for a SqlConnection</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
	/// <returns>An int representing the number of rows affected by the command</returns>
	public static int ExecuteNonQueryTypedParams(String connectionString, String spName, DataRow dataRow)
	{
		if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		// If the row has values, the store procedure parameters must be initialized
		if (dataRow != null && dataRow.ItemArray.Length > 0)
		{
			// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
			SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

			// Set the parameters values
			AssignParameterValues(commandParameters, dataRow);

			return SqlHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName, commandParameters);
		}
		else
		{
			return SqlHelper.ExecuteNonQuery(connectionString, CommandType.StoredProcedure, spName);
		}
	}

	/// <summary>
	/// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified SqlConnection 
	/// using the dataRow column values as the stored procedure's parameters values.  
	/// This method will query the database to discover the parameters for the 
	/// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
	/// </summary>
	/// <param name="connection">A valid SqlConnection object</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
	/// <returns>An int representing the number of rows affected by the command</returns>
	public static int ExecuteNonQueryTypedParams(SqlConnection connection, String spName, DataRow dataRow)
	{
		if (connection == null) throw new ArgumentNullException("connection");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		// If the row has values, the store procedure parameters must be initialized
		if (dataRow != null && dataRow.ItemArray.Length > 0)
		{
			// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
			SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

			// Set the parameters values
			AssignParameterValues(commandParameters, dataRow);

			return SqlHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName, commandParameters);
		}
		else
		{
			return SqlHelper.ExecuteNonQuery(connection, CommandType.StoredProcedure, spName);
		}
	}

	/// <summary>
	/// Execute a stored procedure via a SqlCommand (that returns no resultset) against the specified
	/// SqlTransaction using the dataRow column values as the stored procedure's parameters values.
	/// This method will query the database to discover the parameters for the 
	/// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
	/// </summary>
	/// <param name="transaction">A valid SqlTransaction object</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
	/// <returns>An int representing the number of rows affected by the command</returns>
	public static int ExecuteNonQueryTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
	{
		if (transaction == null) throw new ArgumentNullException("transaction");
		if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		// Sf the row has values, the store procedure parameters must be initialized
		if (dataRow != null && dataRow.ItemArray.Length > 0)
		{
			// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
			SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

			// Set the parameters values
			AssignParameterValues(commandParameters, dataRow);

			return SqlHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName, commandParameters);
		}
		else
		{
			return SqlHelper.ExecuteNonQuery(transaction, CommandType.StoredProcedure, spName);
		}
	}

	#endregion

	#region ExecuteDatasetTypedParams

	/// <summary>
	/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in 
	/// the connection string using the dataRow column values as the stored procedure's parameters values.
	/// This method will query the database to discover the parameters for the 
	/// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
	/// </summary>
	/// <param name="connectionString">A valid connection string for a SqlConnection</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
	/// <returns>A dataset containing the resultset generated by the command</returns>
	public static DataSet ExecuteDatasetTypedParams(string connectionString, String spName, DataRow dataRow)
	{
		if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		//If the row has values, the store procedure parameters must be initialized
		if (dataRow != null && dataRow.ItemArray.Length > 0)
		{
			// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
			SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

			// Set the parameters values
			AssignParameterValues(commandParameters, dataRow);

			return SqlHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName, commandParameters);
		}
		else
		{
			return SqlHelper.ExecuteDataset(connectionString, CommandType.StoredProcedure, spName);
		}
	}

	/// <summary>
	/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 
	/// using the dataRow column values as the store procedure's parameters values.
	/// This method will query the database to discover the parameters for the 
	/// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
	/// </summary>
	/// <param name="connection">A valid SqlConnection object</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
	/// <returns>A dataset containing the resultset generated by the command</returns>
	public static DataSet ExecuteDatasetTypedParams(SqlConnection connection, String spName, DataRow dataRow)
	{
		if (connection == null) throw new ArgumentNullException("connection");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		// If the row has values, the store procedure parameters must be initialized
		if (dataRow != null && dataRow.ItemArray.Length > 0)
		{
			// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
			SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

			// Set the parameters values
			AssignParameterValues(commandParameters, dataRow);

			return SqlHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName, commandParameters);
		}
		else
		{
			return SqlHelper.ExecuteDataset(connection, CommandType.StoredProcedure, spName);
		}
	}

	/// <summary>
	/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlTransaction 
	/// using the dataRow column values as the stored procedure's parameters values.
	/// This method will query the database to discover the parameters for the 
	/// stored procedure (the first time each stored procedure is called), and assign the values based on row values.
	/// </summary>
	/// <param name="transaction">A valid SqlTransaction object</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
	/// <returns>A dataset containing the resultset generated by the command</returns>
	public static DataSet ExecuteDatasetTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
	{
		if (transaction == null) throw new ArgumentNullException("transaction");
		if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		// If the row has values, the store procedure parameters must be initialized
		if (dataRow != null && dataRow.ItemArray.Length > 0)
		{
			// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
			SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

			// Set the parameters values
			AssignParameterValues(commandParameters, dataRow);

			return SqlHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName, commandParameters);
		}
		else
		{
			return SqlHelper.ExecuteDataset(transaction, CommandType.StoredProcedure, spName);
		}
	}

	#endregion

	#region ExecuteReaderTypedParams

	/// <summary>
	/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the database specified in 
	/// the connection string using the dataRow column values as the stored procedure's parameters values.
	/// This method will query the database to discover the parameters for the 
	/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
	/// </summary>
	/// <param name="connectionString">A valid connection string for a SqlConnection</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
	/// <returns>A SqlDataReader containing the resultset generated by the command</returns>
	public static SqlDataReader ExecuteReaderTypedParams(String connectionString, String spName, DataRow dataRow)
	{
		if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		// If the row has values, the store procedure parameters must be initialized
		if (dataRow != null && dataRow.ItemArray.Length > 0)
		{
			// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
			SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

			// Set the parameters values
			AssignParameterValues(commandParameters, dataRow);

			return SqlHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName, commandParameters);
		}
		else
		{
			return SqlHelper.ExecuteReader(connectionString, CommandType.StoredProcedure, spName);
		}
	}


	/// <summary>
	/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 
	/// using the dataRow column values as the stored procedure's parameters values.
	/// This method will query the database to discover the parameters for the 
	/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
	/// </summary>
	/// <param name="connection">A valid SqlConnection object</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
	/// <returns>A SqlDataReader containing the resultset generated by the command</returns>
	public static SqlDataReader ExecuteReaderTypedParams(SqlConnection connection, String spName, DataRow dataRow)
	{
		if (connection == null) throw new ArgumentNullException("connection");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		// If the row has values, the store procedure parameters must be initialized
		if (dataRow != null && dataRow.ItemArray.Length > 0)
		{
			// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
			SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

			// Set the parameters values
			AssignParameterValues(commandParameters, dataRow);

			return SqlHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName, commandParameters);
		}
		else
		{
			return SqlHelper.ExecuteReader(connection, CommandType.StoredProcedure, spName);
		}
	}

	/// <summary>
	/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlTransaction 
	/// using the dataRow column values as the stored procedure's parameters values.
	/// This method will query the database to discover the parameters for the 
	/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
	/// </summary>
	/// <param name="transaction">A valid SqlTransaction object</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
	/// <returns>A SqlDataReader containing the resultset generated by the command</returns>
	public static SqlDataReader ExecuteReaderTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
	{
		if (transaction == null) throw new ArgumentNullException("transaction");
		if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		// If the row has values, the store procedure parameters must be initialized
		if (dataRow != null && dataRow.ItemArray.Length > 0)
		{
			// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
			SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

			// Set the parameters values
			AssignParameterValues(commandParameters, dataRow);

			return SqlHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
		}
		else
		{
			return SqlHelper.ExecuteReader(transaction, CommandType.StoredProcedure, spName);
		}
	}

	#endregion

	#region ExecuteScalarTypedParams

	/// <summary>
	/// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the database specified in 
	/// the connection string using the dataRow column values as the stored procedure's parameters values.
	/// This method will query the database to discover the parameters for the 
	/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
	/// </summary>
	/// <param name="connectionString">A valid connection string for a SqlConnection</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
	/// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
	public static object ExecuteScalarTypedParams(String connectionString, String spName, DataRow dataRow)
	{
		if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		// If the row has values, the store procedure parameters must be initialized
		if (dataRow != null && dataRow.ItemArray.Length > 0)
		{
			// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
			SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connectionString, spName);

			// Set the parameters values
			AssignParameterValues(commandParameters, dataRow);

			return SqlHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName, commandParameters);
		}
		else
		{
			return SqlHelper.ExecuteScalar(connectionString, CommandType.StoredProcedure, spName);
		}
	}

	/// <summary>
	/// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified SqlConnection 
	/// using the dataRow column values as the stored procedure's parameters values.
	/// This method will query the database to discover the parameters for the 
	/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
	/// </summary>
	/// <param name="connection">A valid SqlConnection object</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
	/// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
	public static object ExecuteScalarTypedParams(SqlConnection connection, String spName, DataRow dataRow)
	{
		if (connection == null) throw new ArgumentNullException("connection");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		// If the row has values, the store procedure parameters must be initialized
		if (dataRow != null && dataRow.ItemArray.Length > 0)
		{
			// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
			SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

			// Set the parameters values
			AssignParameterValues(commandParameters, dataRow);

			return SqlHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName, commandParameters);
		}
		else
		{
			return SqlHelper.ExecuteScalar(connection, CommandType.StoredProcedure, spName);
		}
	}

	/// <summary>
	/// Execute a stored procedure via a SqlCommand (that returns a 1x1 resultset) against the specified SqlTransaction
	/// using the dataRow column values as the stored procedure's parameters values.
	/// This method will query the database to discover the parameters for the 
	/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
	/// </summary>
	/// <param name="transaction">A valid SqlTransaction object</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
	/// <returns>An object containing the value in the 1x1 resultset generated by the command</returns>
	public static object ExecuteScalarTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
	{
		if (transaction == null) throw new ArgumentNullException("transaction");
		if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		// If the row has values, the store procedure parameters must be initialized
		if (dataRow != null && dataRow.ItemArray.Length > 0)
		{
			// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
			SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

			// Set the parameters values
			AssignParameterValues(commandParameters, dataRow);

			return SqlHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName, commandParameters);
		}
		else
		{
			return SqlHelper.ExecuteScalar(transaction, CommandType.StoredProcedure, spName);
		}
	}

	#endregion

	#region ExecuteXmlReaderTypedParams

	/// <summary>
	/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlConnection 
	/// using the dataRow column values as the stored procedure's parameters values.
	/// This method will query the database to discover the parameters for the 
	/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
	/// </summary>
	/// <param name="connection">A valid SqlConnection object</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
	/// <returns>An XmlReader containing the resultset generated by the command</returns>
	public static XmlReader ExecuteXmlReaderTypedParams(SqlConnection connection, String spName, DataRow dataRow)
	{
		if (connection == null) throw new ArgumentNullException("connection");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		// If the row has values, the store procedure parameters must be initialized
		if (dataRow != null && dataRow.ItemArray.Length > 0)
		{
			// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
			SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(connection, spName);

			// Set the parameters values
			AssignParameterValues(commandParameters, dataRow);

			return SqlHelper.ExecuteXmlReader(connection, CommandType.StoredProcedure, spName, commandParameters);
		}
		else
		{
			return SqlHelper.ExecuteXmlReader(connection, CommandType.StoredProcedure, spName);
		}
	}

	/// <summary>
	/// Execute a stored procedure via a SqlCommand (that returns a resultset) against the specified SqlTransaction 
	/// using the dataRow column values as the stored procedure's parameters values.
	/// This method will query the database to discover the parameters for the 
	/// stored procedure (the first time each stored procedure is called), and assign the values based on parameter order.
	/// </summary>
	/// <param name="transaction">A valid SqlTransaction object</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="dataRow">The dataRow used to hold the stored procedure's parameter values.</param>
	/// <returns>An XmlReader containing the resultset generated by the command</returns>
	public static XmlReader ExecuteXmlReaderTypedParams(SqlTransaction transaction, String spName, DataRow dataRow)
	{
		if (transaction == null) throw new ArgumentNullException("transaction");
		if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		// If the row has values, the store procedure parameters must be initialized
		if (dataRow != null && dataRow.ItemArray.Length > 0)
		{
			// Pull the parameters for this stored procedure from the parameter cache (or discover them & populate the cache)
			SqlParameter[] commandParameters = SqlHelperParameterCache.GetSpParameterSet(transaction.Connection, spName);

			// Set the parameters values
			AssignParameterValues(commandParameters, dataRow);

			return SqlHelper.ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName, commandParameters);
		}
		else
		{
			return SqlHelper.ExecuteXmlReader(transaction, CommandType.StoredProcedure, spName);
		}
	}

	#endregion
}

/// <summary>
/// SqlHelperParameterCache provides functions to leverage a static cache of procedure parameters, and the
/// ability to discover parameters for stored procedures at run-time.
/// </summary>
public sealed class SqlHelperParameterCache
{
	#region private methods, variables, and constructors

	//Since this class provides only static methods, make the default constructor private to prevent 
	//instances from being created with "new SqlHelperParameterCache()"
	private SqlHelperParameterCache()
	{
	}

	private static Hashtable paramCache = Hashtable.Synchronized(new Hashtable());

	/// <summary>
	/// Resolve at run time the appropriate set of SqlParameters for a stored procedure
	/// </summary>
	/// <param name="connection">A valid SqlConnection object</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="includeReturnValueParameter">Whether or not to include their return value parameter</param>
	/// <returns>The parameter array discovered.</returns>
	private static SqlParameter[] DiscoverSpParameterSet(SqlConnection connection, string spName, bool includeReturnValueParameter)
	{
		if (connection == null) throw new ArgumentNullException("connection");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		SqlCommand cmd = new SqlCommand(spName, connection);
		cmd.CommandType = CommandType.StoredProcedure;

		connection.Open();
		SqlCommandBuilder.DeriveParameters(cmd);
		connection.Close();

		if (!includeReturnValueParameter)
		{
			cmd.Parameters.RemoveAt(0);
		}

		SqlParameter[] discoveredParameters = new SqlParameter[cmd.Parameters.Count];

		cmd.Parameters.CopyTo(discoveredParameters, 0);

		// Init the parameters with a DBNull value
		foreach (SqlParameter discoveredParameter in discoveredParameters)
		{
			discoveredParameter.Value = DBNull.Value;
		}
		return discoveredParameters;
	}

	/// <summary>
	/// Deep copy of cached SqlParameter array
	/// </summary>
	/// <param name="originalParameters"></param>
	/// <returns></returns>
	private static SqlParameter[] CloneParameters(SqlParameter[] originalParameters)
	{
		SqlParameter[] clonedParameters = new SqlParameter[originalParameters.Length];

		for (int i = 0, j = originalParameters.Length; i < j; i++)
		{
			clonedParameters[i] = (SqlParameter) ((ICloneable) originalParameters[i]).Clone();
		}

		return clonedParameters;
	}

	#endregion private methods, variables, and constructors

	#region caching functions

	/// <summary>
	/// Add parameter array to the cache
	/// </summary>
	/// <param name="connectionString">A valid connection string for a SqlConnection</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <param name="commandParameters">An array of SqlParamters to be cached</param>
	public static void CacheParameterSet(string connectionString, string commandText, params SqlParameter[] commandParameters)
	{
		if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
		if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText");

		string hashKey = connectionString + ":" + commandText;

		paramCache[hashKey] = commandParameters;
	}

	/// <summary>
	/// Retrieve a parameter array from the cache
	/// </summary>
	/// <param name="connectionString">A valid connection string for a SqlConnection</param>
	/// <param name="commandText">The stored procedure name or T-SQL command</param>
	/// <returns>An array of SqlParamters</returns>
	public static SqlParameter[] GetCachedParameterSet(string connectionString, string commandText)
	{
		if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
		if (commandText == null || commandText.Length == 0) throw new ArgumentNullException("commandText");

		string hashKey = connectionString + ":" + commandText;

		SqlParameter[] cachedParameters = paramCache[hashKey] as SqlParameter[];
		if (cachedParameters == null)
		{
			return null;
		}
		else
		{
			return CloneParameters(cachedParameters);
		}
	}

	#endregion caching functions

	#region Parameter Discovery Functions

	/// <summary>
	/// Retrieves the set of SqlParameters appropriate for the stored procedure
	/// </summary>
	/// <remarks>
	/// This method will query the database for this information, and then store it in a cache for future requests.
	/// </remarks>
	/// <param name="connectionString">A valid connection string for a SqlConnection</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <returns>An array of SqlParameters</returns>
	public static SqlParameter[] GetSpParameterSet(string connectionString, string spName)
	{
		return GetSpParameterSet(connectionString, spName, false);
	}

	/// <summary>
	/// Retrieves the set of SqlParameters appropriate for the stored procedure
	/// </summary>
	/// <remarks>
	/// This method will query the database for this information, and then store it in a cache for future requests.
	/// </remarks>
	/// <param name="connectionString">A valid connection string for a SqlConnection</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="includeReturnValueParameter">A bool value indicating whether the return value parameter should be included in the results</param>
	/// <returns>An array of SqlParameters</returns>
	public static SqlParameter[] GetSpParameterSet(string connectionString, string spName, bool includeReturnValueParameter)
	{
		if (connectionString == null || connectionString.Length == 0) throw new ArgumentNullException("connectionString");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		using (SqlConnection connection = new SqlConnection(connectionString))
		{
			return GetSpParameterSetInternal(connection, spName, includeReturnValueParameter);
		}
	}

	/// <summary>
	/// Retrieves the set of SqlParameters appropriate for the stored procedure
	/// </summary>
	/// <remarks>
	/// This method will query the database for this information, and then store it in a cache for future requests.
	/// </remarks>
	/// <param name="connection">A valid SqlConnection object</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <returns>An array of SqlParameters</returns>
	internal static SqlParameter[] GetSpParameterSet(SqlConnection connection, string spName)
	{
		return GetSpParameterSet(connection, spName, false);
	}

	/// <summary>
	/// Retrieves the set of SqlParameters appropriate for the stored procedure
	/// </summary>
	/// <remarks>
	/// This method will query the database for this information, and then store it in a cache for future requests.
	/// </remarks>
	/// <param name="connection">A valid SqlConnection object</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="includeReturnValueParameter">A bool value indicating whether the return value parameter should be included in the results</param>
	/// <returns>An array of SqlParameters</returns>
	internal static SqlParameter[] GetSpParameterSet(SqlConnection connection, string spName, bool includeReturnValueParameter)
	{
		if (connection == null) throw new ArgumentNullException("connection");
		using (SqlConnection clonedConnection = (SqlConnection) ((ICloneable) connection).Clone())
		{
			return GetSpParameterSetInternal(clonedConnection, spName, includeReturnValueParameter);
		}
	}

	/// <summary>
	/// Retrieves the set of SqlParameters appropriate for the stored procedure
	/// </summary>
	/// <param name="connection">A valid SqlConnection object</param>
	/// <param name="spName">The name of the stored procedure</param>
	/// <param name="includeReturnValueParameter">A bool value indicating whether the return value parameter should be included in the results</param>
	/// <returns>An array of SqlParameters</returns>
	private static SqlParameter[] GetSpParameterSetInternal(SqlConnection connection, string spName, bool includeReturnValueParameter)
	{
		if (connection == null) throw new ArgumentNullException("connection");
		if (spName == null || spName.Length == 0) throw new ArgumentNullException("spName");

		string hashKey = connection.ConnectionString + ":" + spName + (includeReturnValueParameter ? ":include ReturnValue Parameter" : "");

		SqlParameter[] cachedParameters;

		cachedParameters = paramCache[hashKey] as SqlParameter[];
		if (cachedParameters == null)
		{
			SqlParameter[] spParameters = DiscoverSpParameterSet(connection, spName, includeReturnValueParameter);
			paramCache[hashKey] = spParameters;
			cachedParameters = spParameters;
		}

		return CloneParameters(cachedParameters);
	}

	#endregion Parameter Discovery Functions
}
